Question

Glen received 6 birthday cards. If he is equally likely to read the cards in any order, what is the probability he reads the card from his parents and the card from his sister before the other cards.

Answer 1

The probability of him picking the parents card is (1/6)

After that, there are only five cards left, so what would the probability be for the sisters card?

Multiply the two probabilities once you’ve figured that out. Finally, there are two possible orders to read the cards (parents then sisters, or the other way around) so you’d multiply the result by 2.